How often should one measure the EC and SAR of soil in a crop field?
Because sodium affects soil textures differently, it is necessary to have the soil sent to the lab for a texture analysis of percent sand, silt and clay. This analysis need only be done one time. If the soil or irrigation water is of marginal quality, the soil should be tested annually for EC and SAR prior to crop planting (have the lab test EC and SAR while they test for nutrients). Data should be compared to previous years to determine the trend of EC and SAR over time. If proper management practices are being performed, the trend should be downward or constant. For more information on soil sampling and for a list of soil testing labs in your region, go to MSU Nutrient Management Information web site. Select “Module 1: Soil Sampling and Laboratory Selection” and refer to page 8.
Related Questions
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- How often should one measure the EC and SAR of soil in a crop field?
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